WO2011051512A1 - Public-address-system quality-control device - Google Patents
Public-address-system quality-control device Download PDFInfo
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- WO2011051512A1 WO2011051512A1 PCT/ES2010/000433 ES2010000433W WO2011051512A1 WO 2011051512 A1 WO2011051512 A1 WO 2011051512A1 ES 2010000433 W ES2010000433 W ES 2010000433W WO 2011051512 A1 WO2011051512 A1 WO 2011051512A1
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- WIPO (PCT)
- Prior art keywords
- signal input
- input connector
- degraded
- signal
- control device
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R27/00—Public address systems
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
- G10L25/69—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for evaluating synthetic or decoded voice signals
Definitions
- the present invention relates to a device that has been specially designed to measure the rate of voice transmission of a public address system, using voice signals instead of the test signals used in traditional methods.
- the object of the invention is to achieve a device that allows quantifying the sound quality of the installation, as well as controlling the modules of the rest of the device without interfering with the operation of the public address system.
- the public address quality control device proposed by the invention comes to fill the technical void described above, allowing automatically assess the quality of the audio signal that reaches the audience, as well as make the corresponding corrections.
- the device that is recommended is constituted from a housing or main unit, in which a pair of input connectors are established, to connect the original audio signal, as well as to input the real or degraded signal emitted to the audience, and that will be picked up through a microphone established within said local or audience place, connectors associated with the corresponding analog / digital converters, which transform the input signal to the digital domain, so that these signals are analyzed by a digital signal processor, equipped with an internal programming firmware, in charge of calculating the original and the degraded signal to obtain the modulation indices and, subsequently, the sound quality values.
- the device is complemented with a screen, through which the calculated values for each of the messages are shown, as well as with an interface or device configuration button.
- the programming firmware will allow the following functions to be carried out: - Delay calculation: calculates the possible delay that may exist between both signals, to align them in time. - Cross correlation calculation: allows to know, in a first step, the similarity between both signals, to determine if the degraded signal really is a degradation of the original signal, or a totally foreign signal (external noises, interferences, etc).
- the intelligibility of the sound message is calculated from the reduction of the modulation indices and following the parameters indicated in the IEC-60268-16 standard).
- the value obtained in the previous step gives the value of the sound quality of the message, in the case that the correlation value is above a certain threshold. In the case that the correlation value is below the threshold, zero sound quality is understood, due to the external noise.
- Figure 1 shows a perspective view of a public address quality control device made in accordance with the object of the present invention.
- Figure 2.- Shows a block diagram of the internal structure of the device of the previous figure.
- Figure 3 shows, finally, a block diagram of the operation or process of signal processing that is carried out with the device of the invention.
- the device that is recommended is constituted from a housing (1) in which at least one original signal input connector (2) and a degraded signal input connector (3) are established. , so that said degraded signal input connector (3) is connected to a microphone (4) located in the area of audience, while a connection cable (5) will be connected to the equipment or installation to be tested to the original signal input connector (2).
- Said connectors will be associated to respective digital analog converters (6) through which said signals are digitized, and processed by a digital signal processor (7), which analyzes both signals, and performs calculations on the original signal and the gradient to obtain the modulation indices as well as, subsequently, the sound quality values.
- Said digital signal processor (7) is assisted by a screen (8) as well as by a storage memory (9), with the classic power supply (10) assisted by the corresponding power connector (11), as well as with a control interface (12) in which a series of buttons and switches (13) are established to carry out the on / off of the device, as well as its configuration.
- the device is complemented with a series of light signals (14) of different colors, through which it is shown whether the calculated values are suitable or not.
- the device also includes an output connector (23) for communication with external equipment (15), such as a data network or an external computer, being able to send data such as sound quality, duration, sound level, signal to noise ratio. It also sends warning signals in case the sound quality levels are below the threshold.
- external equipment such as a data network or an external computer
- This connector will allow the equipment to be configured through external equipment such as a computer.
- the delay calculation (16) that may exist between both signals is carried out, to align them in time.
- the cross correlation calculation (17) is carried out, which allows to know, in a first step, the similarity between both signals, to determine if the degraded signal really is a degradation of the original signal, or a totally foreign signal (external noise, interference, etc).
- the modulation indices (18) of the envelope of the voice signal for different frequency bands are then calculated and the reduction of indices (19) is carried out, in which, by means of a division, it is calculated how much the modulation indices in the degraded signal.
- the intelligibility calculation (20) of the sound message is then carried out based on the reduction of modulation rates and following the parameters indicated in the IEC-60268-16 standard).
- the value obtained in the previous step gives the value of the sound quality of the message (21), in the case that the correlation value (17) is above a certain threshold. In the event that the correlation value is below the threshold, zero sound quality (22) is understood, due to the external noise.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Computational Linguistics (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Multimedia (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
Description
DISPOSITIVO DE CONTROL DE CALIDAD DE MEGAFONÍA MEGAPHONY QUALITY CONTROL DEVICE
D E S C R I P C I Ó N D E S C R I P C I Ó N
OBJETO DE LA INVENCIÓN OBJECT OF THE INVENTION
La presente invención se refiere a un dispositivo que ha sido concebido especialmente para medir el índice de transmisión de la voz de un sistema de megafonía, utilizando señales de voz en lugar de las señales de prueba utilizadas en los métodos tradicionales. The present invention relates to a device that has been specially designed to measure the rate of voice transmission of a public address system, using voice signals instead of the test signals used in traditional methods.
El objeto de la invención es conseguir un dispositivo que permita cuantificar la calidad sonora de la instalación, así como realizar el control de módulos del resto del dispositivo sin interferir en el funcionamiento del sistema de megafonía. The object of the invention is to achieve a device that allows quantifying the sound quality of the installation, as well as controlling the modules of the rest of the device without interfering with the operation of the public address system.
ANTECEDENTES DE LA INVENCIÓN BACKGROUND OF THE INVENTION
Actualmente la comprobación del funcionamiento de sistemas de megafonía se realiza mediante el chequeo de la impedancia eléctrica de las líneas de megafonía. Este chequeo permite comprobar que los altavoces de la línea de megafonía están conectados correctamente, sin existir cortocircuitos o desconexiones. Sin embargo, este chequeo no permite conocer si el mensaje sonoro llega adecuadamente a la audiencia ya que no se comprueba la señal sonora, ni las posibles degradaciones que puede sufrir. Currently, the operation of public address systems is checked by checking the electrical impedance of the public address lines. This check allows to verify that the loudspeakers of the public address line are connected correctly, without short circuits or disconnections. However, this check does not allow to know if the sound message reaches the audience properly since the sound signal is not checked, nor the possible degradations that it can suffer.
Respecto a la cuantifícación de la calidad sonora, existe una norma internacional redactada por la Comisión Electrotécnica Internacional (IEC-60268-16), que describe un método para cuantifícar la calidad sonora de un sistema de megafonía, obteniéndose los parámetros conocidos como STI ó RASTI. Para llevar a cabo este método es necesario usar unas señales de prueba, como son un "ruido rosa" o un "barrido en frecuencias". De esta manera, este método es útil para realizar la verificación de un sistema de megafonía en la fase de instalación, pero no permite chequear la calidad del sistema de megafonía una vez está en funcionamiento, no pudiendo conocer ni dar aviso de las degradaciones que pueden aparecer en el sistema de megafonía a lo largo de su tiempo de vida. Regarding the quantification of sound quality, there is a international standard drafted by the International Electrotechnical Commission (IEC-60268-16), which describes a method to quantify the sound quality of a public address system, obtaining the parameters known as STI or RASTI. To carry out this method it is necessary to use test signals, such as a "pink noise" or a "frequency sweep". In this way, this method is useful to perform the verification of a public address system during the installation phase, but it does not allow checking the quality of the public address system once it is in operation, being unable to know or give notice of the degradations that may occur. appear in the public address system throughout its lifetime.
Así pues, es bastante frecuente que la señal original se vea distorsionada por ruidos, reverberaciones, ecos y otros efectos de sala, por lo que dicha señal debe ser tratada o corregida. Thus, it is quite common that the original signal is distorted by noise, reverberations, echoes and other room effects, so that signal must be treated or corrected.
Para ello, y hasta la fecha, dichas pruebas de sonido se llevan a cabo mediante la utilización de señales de voz, las cuales son reproducidas por la instalación de audio, de manera que un técnico, a partir de su propia fineza de oído determina la calidad de las señales de audio emitidas. To do this, and to date, these sound tests are carried out through the use of voice signals, which are reproduced by the audio installation, so that a technician, from his own ear fineness determines the quality of the audio signals emitted.
Evidentemente se trata de un proceso "artesanal" , totalmente subjetivo, que a todas luces sería deseable automatizar, con un dispositivo que sea totalmente objetivo. Obviously it is a totally handmade "handmade" process, which would clearly be desirable to automate, with a device that is totally objective.
DESCRIPCIÓN DE LA INVENCIÓN DESCRIPTION OF THE INVENTION
El dispositivo de control de calidad de megafonía que la invención propone viene a llenar el vacío técnico anteriormente expuesto, permitiendo de forma automática valorar la calidad de la señal de audio que llega a la audiencia, así como, hacer las correspondientes correcciones. Para ello y de forma mas concreta, el dispositivo que se preconiza está constituido a partir de una carcasa o unidad principal, en la que se establecen una pareja de conectores de entrada, para conectar la señal de audio original, así como para entrada de la señal real o degradada emitida a la audiencia, y que será captada a través de un micrófono establecido en el seno del citado local o lugar de audiencia, conectores asociados a los correspondientes conversores analógico/digitales, que transforman la señal de entrada al dominio digital, de manera que dichas señales son analizadas por un procesador de señal digital, dotado de un firmware de programación interno, encargado de realizar los cálculos sobre la señal original y la degradada para obtener los índices de modulación y, posteriormente, los valores de calidad sonora. The public address quality control device proposed by the invention comes to fill the technical void described above, allowing automatically assess the quality of the audio signal that reaches the audience, as well as make the corresponding corrections. For this and more specifically, the device that is recommended is constituted from a housing or main unit, in which a pair of input connectors are established, to connect the original audio signal, as well as to input the real or degraded signal emitted to the audience, and that will be picked up through a microphone established within said local or audience place, connectors associated with the corresponding analog / digital converters, which transform the input signal to the digital domain, so that these signals are analyzed by a digital signal processor, equipped with an internal programming firmware, in charge of calculating the original and the degraded signal to obtain the modulation indices and, subsequently, the sound quality values.
El dispositivo se complementa con una pantalla, a través de la que se muestran los valores calculados para cada uno de los mensajes, así como con una interfaz o botonera de configuración del dispositivo. The device is complemented with a screen, through which the calculated values for each of the messages are shown, as well as with an interface or device configuration button.
Igualmente se complementa con una serie de testigos luminosos a través de los que se indican si los valores calculados son adecuados o no. It is also complemented by a series of luminous witnesses, indicating whether the calculated values are adequate or not.
Dichos valores se almacenarán en una memoria, así como las señales captadas. These values will be stored in a memory, as well as the signals captured.
Así pues, el firmware de programación permitirá llevar a cabo las siguientes funciones: - Cálculo de retardo: calcula el posible retardo que pueda existir entre ambas señales, para alinearlas en el tiempo. - Cálculo correlación cruzada: permite conocer, en un primer paso, la similitud entre ambas señales, para determinar si la señal degradada realmente es una degradación de la señal original, o una señal totalmente ajena (ruidos externos, interferencias, etc). Thus, the programming firmware will allow the following functions to be carried out: - Delay calculation: calculates the possible delay that may exist between both signals, to align them in time. - Cross correlation calculation: allows to know, in a first step, the similarity between both signals, to determine if the degraded signal really is a degradation of the original signal, or a totally foreign signal (external noises, interferences, etc).
- índices de modulación: calcula los índices de modulación de la envolvente de la señal de voz para diferentes bandas de frecuencias - modulation indices: calculates the modulation indices of the voice signal envelope for different frequency bands
- Reducción de índices: mediante una división, calcula cuánto han disminuido los índices de modulación en la señal degradada. - Reduction of indices: by means of a division, it calculates how much the modulation indices in the degraded signal have decreased.
- Cálculo de la inteligibilidad: se calcula la inteligibilidad del mensaje sonoro a partir de la reducción de los índices de modulación y siguiendo los parámetros indicados en la norma IEC-60268-16). - Calculation of the intelligibility: the intelligibility of the sound message is calculated from the reduction of the modulation indices and following the parameters indicated in the IEC-60268-16 standard).
El valor obtenido en el paso anterior (con rango entre Ό' y T) da el valor de la calidad sonora del mensaje, en el caso que el valor de correlación esté por encima de un umbral determinado. En el caso de que el valor de la correlación esté por debajo del umbral se entiende calidad sonora nula, debido al ruido exterior. The value obtained in the previous step (with a range between Ό 'and T) gives the value of the sound quality of the message, in the case that the correlation value is above a certain threshold. In the case that the correlation value is below the threshold, zero sound quality is understood, due to the external noise.
Se consigue de esta forma, un dispositivo con el que no es necesario usar señales de prueba para cuantificar la calidad sonora, ya que se usan los propios mensajes transmitidos por el sistema de megafonía, permitiendo llevar a cabo una monitorización y alerta constante y en tiempo real del sistema megafonía, así como el control de la cadena completa del sonido ya que se analiza la señal sonora que llega a la audiencia. DESCRIPCIÓN DE LOS DIBUJOS In this way, a device is achieved with which it is not necessary to use test signals to quantify the sound quality, since the messages transmitted by the public address system are used, allowing constant and timely monitoring and alerting. real public address system, as well as the control of the complete sound chain as the sound signal that reaches the audience is analyzed. DESCRIPTION OF THE DRAWINGS
Para complementar la descripción que se está realizando y con objeto de ayudar a una mejor comprensión de las características del invento, de acuerdo con un ejemplo preferente de realización práctica del mismo, se acompaña como parte integrante de dicha descripción, un juego de dibujos en donde con carácter ilustrativo y no limitativo, se ha representado lo siguiente: To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, according to a preferred example of practical implementation thereof, a set of drawings is attached as an integral part of said description. In an illustrative and non-limiting manner, the following has been represented:
La figura 1.- Muestra, una vista en perspectiva de un dispositivo de control de calidad de megafonía realizado de acuerdo con el objeto de la presente invención. La figura 2.- Muestra un diagrama de bloques de la estructura interna del dispositivo de la figura anterior. Figure 1 shows a perspective view of a public address quality control device made in accordance with the object of the present invention. Figure 2.- Shows a block diagram of the internal structure of the device of the previous figure.
La figura 3.- Muestra, finalmente, un diagrama de bloques del funcionamiento o proceso de tratamiento de señales que se lleva a cabo con el dispositivo de la invención. Figure 3 shows, finally, a block diagram of the operation or process of signal processing that is carried out with the device of the invention.
REALIZACIÓN PREFERENTE DE LA INVENCIÓN A la vista de las figuras reseñadas, y en especial de las figurasPREFERRED EMBODIMENT OF THE INVENTION In view of the figures outlined, and especially the figures
1 y 2, puede observarse como el dispositivo que se preconiza está constituido a partir de una carcasa (1) en la que se establece al menos un conector de entrada de señal original (2) y un conector de entrada de señal degradada (3), de manera que a dicho conector de entrada de señal degradada (3) se le conecta un micrófono (4) situado en la zona de audiencia, mientras que al conector de entrada de señal original (2) se conectará un cable de conexión (5) al equipo o instalación a testear. 1 and 2, it can be seen how the device that is recommended is constituted from a housing (1) in which at least one original signal input connector (2) and a degraded signal input connector (3) are established. , so that said degraded signal input connector (3) is connected to a microphone (4) located in the area of audience, while a connection cable (5) will be connected to the equipment or installation to be tested to the original signal input connector (2).
Dichos conectores estará asociados a respectivos conversores analógico digitales (6) a través de los que dichas señales son digitalizadas, y procesadas por un procesador de señal digital (7), que analiza ambas señales, y lleva a cabo los cálculos sobre la señal original y la degradada para obtener los índices de modulación así como, posteriormente, los valores de calidad sonora. Said connectors will be associated to respective digital analog converters (6) through which said signals are digitized, and processed by a digital signal processor (7), which analyzes both signals, and performs calculations on the original signal and the gradient to obtain the modulation indices as well as, subsequently, the sound quality values.
El citado procesador de señal digital (7) está asistido por una pantalla (8) así como por una memoria (9) de almacenamiento, contando con la clásica fuente de alimentación (10) asistida por el correspondiente conector de alimentación (11), así como con una interfaz de control (12) en la que se establecen una serie de botones e interruptores (13) para llevar a cabo el encendido/apagado del dispositivo, así como su configuración. Said digital signal processor (7) is assisted by a screen (8) as well as by a storage memory (9), with the classic power supply (10) assisted by the corresponding power connector (11), as well as with a control interface (12) in which a series of buttons and switches (13) are established to carry out the on / off of the device, as well as its configuration.
Adicionalmente, el dispositivo se complementa con una serie de testigos luminosos (14) de diferentes colores, a través de los cuales se muestra si los valores calculados son adecuados o no. Additionally, the device is complemented with a series of light signals (14) of different colors, through which it is shown whether the calculated values are suitable or not.
El dispositivo incluye asimismo un conector de salida (23) para comunicación con equipos externos (15), como por ejemplo una red de datos o un ordenador externo, pudiendo enviar datos tales como calidad sonora, duración, nivel sonoro, relación señal a ruido. También envía señales de aviso en el caso de que los niveles de calidad sonora estén por debajo del umbral. Dicho conector permitirá que el equipo sea configurado a través de equipos externos como un ordenador. The device also includes an output connector (23) for communication with external equipment (15), such as a data network or an external computer, being able to send data such as sound quality, duration, sound level, signal to noise ratio. It also sends warning signals in case the sound quality levels are below the threshold. This connector will allow the equipment to be configured through external equipment such as a computer.
Tal y como se puede observar en la figura 3, la operativa del dispositivo, a través de su firmware de programación es la siguiente: As can be seen in Figure 3, the operation of the device, through its programming firmware is as follows:
A partir de la señal original (5) y de la señal degradada (4'), se lleva a cabo el cálculo de retardo (16) que pueda existir entre ambas señales, para alinearlas en el tiempo. Seguidamente se lleva a cabo el cálculo de correlación cruzada (17), el cual permite conocer, en un primer paso, la similitud entre ambas señales, para determinar si la señal degradada realmente es una degradación de la señal original, o una señal totalmente ajena (ruidos externos, interferencias, etc). From the original signal (5) and the degraded signal (4 '), the delay calculation (16) that may exist between both signals is carried out, to align them in time. Then the cross correlation calculation (17) is carried out, which allows to know, in a first step, the similarity between both signals, to determine if the degraded signal really is a degradation of the original signal, or a totally foreign signal (external noise, interference, etc).
Seguidamente se calculan los índices de modulación (18) de la envolvente de la señal de voz para diferentes bandas de frecuencias y se lleva a cabo la reducción de índices (19), en la que, mediante una división, se calcula cuánto han disminuido los índices de modulación en la señal degradada. The modulation indices (18) of the envelope of the voice signal for different frequency bands are then calculated and the reduction of indices (19) is carried out, in which, by means of a division, it is calculated how much the modulation indices in the degraded signal.
A continuación se lleva a cabo el cálculo de la inteligibilidad (20) del mensaje sonoro a partir de la reducción de los índices de modulación y siguiendo los parámetros indicados en la norma IEC-60268- 16). The intelligibility calculation (20) of the sound message is then carried out based on the reduction of modulation rates and following the parameters indicated in the IEC-60268-16 standard).
El valor obtenido en el paso anterior (con rango entre O' y T) da el valor de la calidad sonora del mensaje (21), en el caso que el valor de correlación (17) esté por encima de un umbral determinado. En el caso de que el valor de la correlación esté por debajo del umbral se entiende calidad sonora nula (22), debido al ruido exterior. The value obtained in the previous step (with a range between O 'and T) gives the value of the sound quality of the message (21), in the case that the correlation value (17) is above a certain threshold. In the event that the correlation value is below the threshold, zero sound quality (22) is understood, due to the external noise.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES200930589U ES1071646Y (en) | 2009-10-30 | 2009-10-30 | MEGAFONIA QUALITY CONTROL DEVICE |
| ESU200930589 | 2009-10-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011051512A1 true WO2011051512A1 (en) | 2011-05-05 |
Family
ID=41795809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/ES2010/000433 Ceased WO2011051512A1 (en) | 2009-10-30 | 2010-10-26 | Public-address-system quality-control device |
Country Status (2)
| Country | Link |
|---|---|
| ES (1) | ES1071646Y (en) |
| WO (1) | WO2011051512A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2123193A (en) * | 1982-06-19 | 1984-01-25 | James Ernest Gleave | Public address system |
| EP1600941A1 (en) * | 2003-02-27 | 2005-11-30 | Toa Corporation | Dip filter frequency characteristic decision method |
| DE102007031064A1 (en) * | 2006-12-12 | 2008-06-19 | Rudolf Hersch | Emergency device for electro acoustic emergency warning system, has microphone mounted in loudspeakers to measure acoustic pressure of individual loudspeakers, where loud speaker operating analog signal is compared with radiated signal |
| US20080170712A1 (en) * | 2007-01-16 | 2008-07-17 | Phonic Ear Inc. | Sound amplification system |
| WO2009068276A1 (en) * | 2007-11-28 | 2009-06-04 | K+H Vertriebs- Und Entwicklungsgesellschaft Mbh | Loudspeaker device |
-
2009
- 2009-10-30 ES ES200930589U patent/ES1071646Y/en not_active Expired - Fee Related
-
2010
- 2010-10-26 WO PCT/ES2010/000433 patent/WO2011051512A1/en not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2123193A (en) * | 1982-06-19 | 1984-01-25 | James Ernest Gleave | Public address system |
| EP1600941A1 (en) * | 2003-02-27 | 2005-11-30 | Toa Corporation | Dip filter frequency characteristic decision method |
| DE102007031064A1 (en) * | 2006-12-12 | 2008-06-19 | Rudolf Hersch | Emergency device for electro acoustic emergency warning system, has microphone mounted in loudspeakers to measure acoustic pressure of individual loudspeakers, where loud speaker operating analog signal is compared with radiated signal |
| US20080170712A1 (en) * | 2007-01-16 | 2008-07-17 | Phonic Ear Inc. | Sound amplification system |
| WO2009068276A1 (en) * | 2007-11-28 | 2009-06-04 | K+H Vertriebs- Und Entwicklungsgesellschaft Mbh | Loudspeaker device |
Also Published As
| Publication number | Publication date |
|---|---|
| ES1071646U (en) | 2010-03-23 |
| ES1071646Y (en) | 2010-06-17 |
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